How much weight can someone expect to lose in 3 weeks?

 It is not possible for me to accurately predict how much weight someone can expect to lose in a specific period of time, as weight loss can vary greatly from person to person. Many factors can influence weight loss, including a person's diet, exercise habits, and overall health. Additionally, the amount of weight that a person can lose in a given time period will depend on their starting weight and how many calories they are consuming and burning on a daily basis. It is generally recommended to aim for a slow and steady weight loss of 1-2 pounds per week, as this is more sustainable and less likely to lead to muscle loss or other negative side effects.